code: def tearDown(self):
      keras.backend.clear_session()
  
file_path: calamari/calamari_ocr/test/test_model_migration.py
imports: import os
  import shutil
  import tempfile
  import unittest
  from tensorflow import keras
  from tfaip import DeviceConfigParams
  from tfaip.device.device_config import DeviceConfig
  from calamari_ocr.ocr import SavedCalamariModel
  from calamari_ocr.ocr.predict.predictor import Predictor
  from calamari_ocr.test.test_prediction import default_predictor_params, file_dataset
label_desc: Use image node_id 1 for calling the TestModelMigration obj's underlying member method code with example usage: obj.tearDown() without return types